On the
Trillium, the upper bunk is attached to the wood on the bottom of the window. Dump the TV and you should be fine space wise. Certainly you will want the lighter of the two children on the upper bunk, as the lower bunk sits securely on top of the
fiberglass gaucho. On a
Trillium, this gaucho is fiberglassed to the front and side walls, along with the floor across the front. Meanwhile, the top bunk is secured with a hinge to the wood across the bottom of the window, along with two legs going down to the lower bunk. I would have no problem with a full sized adult on the bottom bunk. On the top, no way.
I have no use for a TV in a camper. If I was full time, sure I’d probably want one. For occasional video viewing I find my laptop works just fine. Those upper shelves were not meant to support much
weight. But they are still useful. If nothing else they are a good place to mount
lights.
By the way, the wood surrounding the
windows is prone to rot. At that point, its not supporting a bunk. In my case, when I removed the front rock guard (awning if you will), I was surprised there was no sealing material under the framing at all. So I had rot on the wood and the screws holding the window frame and the rock guard were badly corroded. The wood framing around the windows is basically held in place by those screws and the window framing. The front lower horizontal wood on mine was just a pile of wood fragments. No way it was supporting the top bunk.
So I would remove the front window and rock guard (if you have one), inspect the wood framing, replace any/all wood, new butyl tape, screws and remount. All prior to putting anyone on that top bunk. Plenty of threads in the manufacturers section on repairing
Trillium windows. My front window was the worst, followed by the rear window. Side windows were good.
How important is this maintenance? Just imagine the top bunk collapsing onto the lower bunk with two children on them. Scary! And realize your trailer is over 45 years old.